Tack-strip.



C. N. COLPITTS.

TACK STRIP. APPLICATION men NOV. 15. I913- nwcweo ran. 13. I917.

lgwww, mama NOV 27,- 1.917.

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I TACK-STRIP.

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To all whom it may concern:

Be it known that I, CALVIN N. a citizen of the United States, residing at North Chelmsford, county of Middlesex, State of Massachusetts, have invented an Improvement in Tack-Strips, of which the following description, in .connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to tacks or fastenobject to provide a novel tack which can be made from a strip of sheet metal. The tack herein shown has been especially designed to be used in fastening shade material on shade rollers, but it is equally applicable for use wherever it is desired to fasten sheet material onto a holder, or to fasten two parts together.

I will first describe a selected embodiment of my invention and then novel features thereof in the appended claims.

Referring to the drawings, Figure 1 is a view of a strip of sheet materialfrom which the tack is made;

Fig. 2 is a perspective view of a strip of coiinected tacks formed from the sheet materia Fig. 3 is a perspective view of one of the tacks severed from the strip.

My improved tack is a two-pointed'tack, it having the body portion 1 from which extends the two prongs 2. The body 1 is foursided and the prongs 2 extend from opposite corners thereof, said prongs being formed from portions of the sheet metal strip which are bent up so as to occupy parallel planes. The structural features of my improved tack will be more readily under COLPITTS,

- stood by referring to the way in which the tack is made. I

In making my tack I take a piece of sheet metal 3 and strike up from the opposite longitudinal edges 4 portions thereof to form the prongs 2 thereby to provide the tack strip shown in Fig. 2, and the tacks are made by then severing the individual tack sections from the strip. In forming the prongs from the strip '3, said strip is provided at each edge with a plurality of slits 5 and 6, each slit extending from the edge inwardly toward the center of the strip at an inclination, as shownby the dotted lines in Fig. 1. The slits 5 on one edge of the strip extend from the edge in one direction,

the slitting point out the Specification of Letters Patent. Patented NV 27, 1191 70 Application filed November 15, 1913, Serial No. 801,101.

Renewed February 13, 1917. Serial No. 148,415.

while the slits 6 on the opposite side of the strip extend in the opposite direction. Each slit provides a triangular-shaped portion which when bent up at right angles to the strip forms a prong 2, as shown in Fig. 2. The prongs formed by the slits 5 are bent up fromone direction, while the prongs formed by the slits 6 are bent up from the opposite direction, as will be obvious.

In making the tack strips shown in Fig. 2, of the metal along the lines 5 and 6 and the bending of the prongs up at right angles to the strip can be effected at one operation or may be accomplished at two separate operations, as desired.

The separate tacks are formed from the tack strip shown in Fig. 2 by severing the latter transversely along the dotted lines 7 in Fig. 2. With this construction it will be seen that the opposite edges 8 and 9 of each tack section are formed by slitting the strip and bending up the prongs of an adjacent section. In other words, the prong of each tack section is bent up from the adjacent tack section of the strip. In this way it is possible to provide a two-pointed tack from a strip of sheet metal having perfectly straight edges without any waste of material and to provide a tack of this nature wherein the prongs are in parallel planes.

Owing to the fact that the sides 8 and 9 of each tack are formed by bending up portions of the strip 3 to form the prongs of adexact right angle to the sides 10 formed by severing the individual tack sections from the strip and the body 1 will, therefore, present a more or less diamond shape.

I-Iaving fully described my invention, what I claim as new and desire to secure by Letters Patent is l. A strip of connected tacks comprising a sheet metal strip having a plurality of prongs struck up therefrom lengthwise thereof at each edge, each prong extending at right angles to the strip and occupying a plane at right angles to the length of the strip, all the prongs on one edge of the strip being bent up therefrom in one direction and those on the opposite edge being bent up therefrom in the opposite direction.

2. A strip of connected tacks comprising a strip of sheet metal having a plurality of prongs struck up therefrom at each edge and divided into tack sections, each including a prong diagonally arranged at each,

edge of the strip, each prong extending at name to this specification, in the presence of right angleshto this strip hand Ocfilllpling 1Ia two subscribing witnesses. plane at rig t ang es to t e lengt t ereo and the prongs of each tack section being CALVIN COLPITTS' 5 struck up from the body portion of the ad- Witnesses:

jacent tack section. Lens 0. SMITH, I In testimony whereof, I have signed my THOMAS J. DRUMMOND. 

